CVE-2026-80781 (GCVE-0-2026-80781)
Vulnerability from cvelistv5
Published
2026-09-04 15:12
Modified
2026-10-19 08:43
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
HID: core: fix OOB read of field->usage in hid_set_field()
hid_set_field() hands field->usage + offset to hid_dump_input() before
the guard that bounds offset:
hid_dump_input(field->report->device, field->usage + offset, value);
if (offset >= field->report_count) {
hid_err(...);
return -1;
}
Under CONFIG_DEBUG_FS hid_dump_input() dereferences that pointer, with
buf = hid_resolv_usage(usage->hid, NULL). The usage[] array is
allocated inline with the hid_field in hid_register_field() and holds
field->maxusage entries, so an offset past it reads off the end of the
kvzalloc()ed allocation and into a neighbouring object. Had the guard
run first, offset < report_count <= maxusage would already have confined
the pointer to the array.
A caller supplies such an offset today. picolcd_fb_send_tile()
validates only report->maxfield before issuing
hid_set_field(report->field[0], 11 + i, ...) for i = 0..31, so its
offsets are fixed at 11..42 and are never checked against the bound
field. When the device registers that field with fewer usages, the
framebuffer deferred-io work drives the read on every tile. KASAN
reports a 4-byte slab-out-of-bounds read in hid_dump_input() below
hid_set_field(), and the same boot logs "offset (1) exceeds
report_count (1)" from the guard that runs only afterwards.
Move the hid_dump_input() call below the guard. Because
field->maxusage >= field->report_count, the guard then establishes that
field->usage + offset lies inside the array before it is dereferenced,
for every caller and without changing behaviour on the valid path.
Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 |
||
{
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"version": "0",
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],
"cpeApplicability": [
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: fix OOB read of field-\u003eusage in hid_set_field()\n\nhid_set_field() hands field-\u003eusage + offset to hid_dump_input() before\nthe guard that bounds offset:\n\n\thid_dump_input(field-\u003ereport-\u003edevice, field-\u003eusage + offset, value);\n\n\tif (offset \u003e= field-\u003ereport_count) {\n\t\thid_err(...);\n\t\treturn -1;\n\t}\n\nUnder CONFIG_DEBUG_FS hid_dump_input() dereferences that pointer, with\nbuf = hid_resolv_usage(usage-\u003ehid, NULL). The usage[] array is\nallocated inline with the hid_field in hid_register_field() and holds\nfield-\u003emaxusage entries, so an offset past it reads off the end of the\nkvzalloc()ed allocation and into a neighbouring object. Had the guard\nrun first, offset \u003c report_count \u003c= maxusage would already have confined\nthe pointer to the array.\n\nA caller supplies such an offset today. picolcd_fb_send_tile()\nvalidates only report-\u003emaxfield before issuing\nhid_set_field(report-\u003efield[0], 11 + i, ...) for i = 0..31, so its\noffsets are fixed at 11..42 and are never checked against the bound\nfield. When the device registers that field with fewer usages, the\nframebuffer deferred-io work drives the read on every tile. KASAN\nreports a 4-byte slab-out-of-bounds read in hid_dump_input() below\nhid_set_field(), and the same boot logs \"offset (1) exceeds\nreport_count (1)\" from the guard that runs only afterwards.\n\nMove the hid_dump_input() call below the guard. Because\nfield-\u003emaxusage \u003e= field-\u003ereport_count, the guard then establishes that\nfield-\u003eusage + offset lies inside the array before it is dereferenced,\nfor every caller and without changing behaviour on the valid path.\n\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e"
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T08:43:36.573Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/465544b3d6602cfbdc2305d5cbfb7f4954353b63"
},
{
"url": "https://git.kernel.org/stable/c/4993e1ab85d7d3f4a40d81852170f9665483bbd8"
},
{
"url": "https://git.kernel.org/stable/c/313ead1abed945544703b100a12c5a10fdf78409"
},
{
"url": "https://git.kernel.org/stable/c/c1d9c16af51cc6ff92a5a062617d3b022dd01078"
},
{
"url": "https://git.kernel.org/stable/c/a38212687519f2a72f43e62dec1348a690412404"
},
{
"url": "https://git.kernel.org/stable/c/9a1d7c5f0d82e8665715d5e47c9410c6a97e3748"
},
{
"url": "https://git.kernel.org/stable/c/5215ea00a747eca34cb2f603cfef91fef76c2558"
},
{
"url": "https://git.kernel.org/stable/c/cbcc0e8dea499e5ca86b583372ccb1815cccc570"
},
{
"url": "https://git.kernel.org/stable/c/a13cdb19fcb223ed41bdab3bab42b98dba87e90b"
}
],
"title": "HID: core: fix OOB read of field-\u003eusage in hid_set_field()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-80781",
"datePublished": "2026-09-04T15:12:52.980Z",
"dateReserved": "2026-08-26T14:34:25.792Z",
"dateUpdated": "2026-10-19T08:43:36.573Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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